A Teaser Trailer of Ice and Fire

The familiar sight of the Dragonstone map table appears to be taken over by an encroaching fog - clearly a reference to the White Walker's progression from beyond the wall down to Westeros. Then we see the sigils of House Stark and House Targaryen freezing over as the fog passes them - bad news for Dany, Arya, Sansa, and Bran and doubly bad news for Jon ...